var n1 = [];
for (var n = 1, i; n++;) {

	if (i = 3 * (n - 1), i < 200) {
		n1.push(i);
	} else {
		break;
	}

}
console.log(n1)
var n2 = [];
for (var a = 0; a < 20; a++) {
	var b = Math.floor(Math.random() * n1.length);
	n2.push(n1[b]);
	n1.splice(b, 1);
}

n2.sort(function(A, B) {
	return B - A;
})
console.log(n2)
